Grate



(No- Model.)

T. CRANEY.

GRATE.

No. 518,714. Patented Apr. 24, 1894.

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UNITED STATES PATENT OFFICE.

THOMAS CRANEY, OF BAY CITY, MICHIGAN.

GRATE.

SPECIFICATION forming part of Letters Patent N0. 518,714, dated April24, 1894.

Application filed January 29, 1894. Serial No. 498,409- (No model.)

To a/ZZ whom it may concern:

Be it known that I, THOMAS GRANEY, a citizen of the United States,residing at Bay City, in the county of Bay and State of Michigan,

` have inventedcertain new and useful Im- .is fed into the furnace atsuch points as to give the best eects in combustion. Further in theconstruction of thegrate bars in connection with a hollow bridge orcross-bar at the rearend of the furnace, having apertures in its rearface adapted to supply air for combustion in rear of the grate. Furtherin the construction of the side grate bars having raised chambers, withperforated rear walls to supply air in the corners wherein the fire isusually slow or dead. Further in the pe culiar construction, arrangementand combin-ation of the various parts.

In the drawings, Figure l is a plan view of a grate embodying myinvention. Fig. 2 is a vertical, central section thereof. Fig. 3 is adetached perspective view of one of the middle grate bars. Fig. 4 is aplan view of a grate bar showing the hollow bridge removed. Fig. 5 is alongitudinal section through one of the end grate bars.

A represents the steam generator and B its setting, provided with theusual air and fuel supply doors at the front and with the bridge Wall Cat the rear end of the grate.

D is a series of fiat grate bars provided with the apertures E andprovided on the under side with a rib or web F forming a truss for thecentral portion of the bar. At the rear end each bar is provided with ahollow passage G leading into a chamberH ina hollow cross-bar or bridge.This cross-bar I may form integral with the grate bars, as shown in Fig.3, but I prefer to make it detachable,

as shown in Fig. 2, in which case I form a flange I, around each of thepassage ways G, and form the bridge in sections, onefor each grate bar,adapted to iit over the same. The

`bridge thus formed consists of the curved xfront wall a and theinclined rear wallb provided with the inclined apertures c to direct thecurrent of air upwardinto the line of the products of combustion andtoward the bottom of the boiler. The side grate bars I provide at therear end with section of the bridge andat the forward end with theraised air supply chamber J, formed by the inclined rear wall K and thestraight front wall K supplying air in the corners above the level ofthe grate, so as to give as good combustion in the corners which areusually dead spaces as in the center or other parts of the grate.

What I claim as my invention isl. In a furnace grate, the combination ofa series of apertured grate bars, having passage ways G at the rear endof each bar, of

the fianges I around such passage ways on A the bars, and the hollowbridge wall formed in sections the width of each bar and comprising thecurved front wall a and the iuclined rear wall b provided with inclinedapertures the lower side of the wall being open and fitting around theiianges, substantially as described.

2. In a furnace, the combination of the grate comprising the perforatedgrate bars, having attheirrearendsahollowraised bridge or cross-bar,having its rear face formed with a series of upwardly inclinedperforations, of the side grate bar having a raised air chamber .I attheir front ends consisting of the rear inclined perforated wall K andthe front vertical wall K', substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

THOMAS CRANEY.

Witnesses:

M. B. ODOGHERTY; O. F. BARTHEL.

